添加注释，部分优化

Runt

2022-08-13 b3a51f064c4dfb27f54cd9526803338d2e8dc296

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<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android" >
    <item android:state_checked="false" android:color="@color/gray_pressed"  />
    <item android:state_checked="true" android:color="@color/txt_normal"  />
</selector>